(This plant comes in a 3.5 inch pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).
Flowers: The blooms are white, pink or purple with a violet to darker purple midvein.
Blooming season: Early spring, and occasionally during the growing season through autumn.
Growth rate: It is a slow growing species.
Watering: During the summer it enjoys average watering, but do not overwater (it rots easily, especially if over wet), allow to dry between watering. Watering should be curtailed during the winter months.
Exposure: They do need a lot of light to develop their typical spination. However, some protection in light shade is recommended during the hottest hours in summer.
Blooming season: Flowers are freely produced from June onwards and remain open for only one day.
It is a good beginner cactus and very easy to grow and flower. It is quite resistant. Requires good drainage and very porous potting mix.
Watering needs: needs regular water in spring to fall but do not water again until dry. Also, it is a species that is dormant in the winter and requires very little water (maybe even none) during the cold months.
Frost tolerance: Light frost protection required.
Sun exposure: Requires bright light (protect from strong midday sun). In shade the body color will remain mostly green, while full sun will darken it and give it red/brown body color.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz